21852166 has 32 divisors (see below), whose sum is σ = 39836160. Its totient is φ = 8781696.

The previous prime is 21852151. The next prime is 21852169. The reversal of 21852166 is 66125812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29695 + ... + 30421.

It is an arithmetic number, because the mean of its divisors is an integer number (1244880).

Almost surely, 2^21852166 is an apocalyptic number.

21852166 is a deficient number, since it is larger than the sum of its proper divisors (17983994).

21852166 is a wasteful number, since it uses less digits than its factorization.

21852166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868.

The product of its digits is 5760, while the sum is 31.

The square root of 21852166 is about 4674.6300388373. The cubic root of 21852166 is about 279.5748906195.

Adding to 21852166 its reverse (66125812), we get a palindrome (87977978).

The spelling of 21852166 in words is "twenty-one million, eight hundred fifty-two thousand, one hundred sixty-six".